I have tried to show in detail as much information as possible about the ink-air interchange that enables every fountain pen to function, general piston filler diagnostics for common issues (both vintage and modern), the ability to change nibs on one feed/section design and purposeful inability on more modern designs, and every nib/feed issue of recent note at the risk of being too long and too detailed. It is hoped you will obtain greater use and enjoyment from your fountain pen as a result of this informational video being posted for your viewing pleasure....as it would never have been possible to do this for as many at a trade or pen show before YouTube. An additional note, since gold reached $400+ an ounce...it is kept at the bank...so before somebody with bad ideas comes to get a pen shoved into their cranium forming an extra orifice to aerate their failed synapses...note the gold is not with me!